package lx;

public class Test4 {
    public static void main(String[] args) {
    	/**
    	 * 给学生的解释 
    	 */
		int n =100;
		Test5 test5=new Test5();
		System.out.println(test5.PI);
		System.out.println(test5.num());
		test5.setZhouchang(23.456);
		System.out.println(test5.zhouchang);
	}
}
